Sofa frame



FIG. 1 is a front perspective view of a sofa frame showing my new design;

FIG. 2 is a right side elevational view, the left side being a mirror image thereof;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of cushions in FIGS. 2-5 is for environmental purposes only, and forms no part of the claimed design. FIGS. 5 and 6 have been drawn to a smaller scale with respect to FIGS. 1-4. 

The ornamental design for a sofa frame, as shown and described. 